cipher - The Twenty Doors (ROOM 4)

This is part of The Twenty Doors series.
The previous one is The Twenty Doors! (ROOM 3)
The next one is The Twenty Doors! (ROOM 5)

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You now enter room 4. This one has a load of A's and B's carved into the wall, along with a message. AAAAA ABAAABAAAB ABBABABBAAAABAA AAAAAABBAAAAABB AAAAB ABAAABAAAB BAABABABAAAABAAABBAABAABABABBA AABABABBABBAABBBAAAA ABAAAABBAA BAABAAABBBAABAA ABABBAAAAAABAAAABBAA AAABABAAAABABBAABBBABAABAABBABAABBABAAAAAAAAAABABB I may not be distinct but I've always loved bacon.

On the floor, as usual, there is a bit of paper.

Bmmp rum gq rfc uyw rm qydcrw!

But this time, there are three doors (not counting the one you just came through). You turn over the paper, and there is something written on the back

This time, press the button on your chosen door to open it, but if you choose the wrong one, prepare to DIE!!!

Hmm... This one involves two cryptograms. Damn. Anyway, you might as well try.

Which door should you go through?

The next door will be added when this door is solved!

Answer

I just joined StackExchange. This is my shot at the answer:

The door you have to pick is

Door two.

To decrypt the cryptogram on the wall

Use the Baconian cipher with I=J and U=V to decrypt it. That gives you the plain text: 'A IS ONE AND X IS TWENTY FOUR IN THE MAIN CRYPTOGRAM'.

To decrypt the one on the paper

It's encrypted with the affine substitution cipher. Decoding it gives you the plain text: 'Door two is the way to safety!'

On to Room 5 (I hope)!